The increase in white collar, service, and professional sector jobs following WWII can be attributed to returning war veterans re-entering the workforce. Thus the correct answer is C.
What is white collar service?
White collar service is referred to as a job that is said to be done in offices or organization settings. As the name suggests the white collar, which reflects that formal wearing dress is mainly managed in coroprations or clerical jobs.
The increase in white-collar jobs or services after World War II resulted in war veterans who have participated in the war and get retired from the service of the military joining the offices to manage their living.
Therefore, option C returning war veterans re-entering the workforce is an approparite answer.
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